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Posted to dev@crunch.apache.org by "Jeremy Lewi (JIRA)" <ji...@apache.org> on 2014/03/23 04:33:42 UTC
[jira] [Created] (CRUNCH-369) Crunch doesn't use custom getSplits
functions of FileInputFormat subclasses
Jeremy Lewi created CRUNCH-369:
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Summary: Crunch doesn't use custom getSplits functions of FileInputFormat subclasses
Key: CRUNCH-369
URL: https://issues.apache.org/jira/browse/CRUNCH-369
Project: Crunch
Issue Type: Bug
Components: IO
Affects Versions: 0.9.0
Reporter: Jeremy Lewi
Priority: Minor
Suppose I create a source for a custom InputFormat which is a subclass of FileInputFormat; e.g.
TableSource<LongWritable, FastQWritable> source = From.formattedFile(
inputFile, FastQInputFormatNew.class, LongWritable.class,
FastQWritable.class);
where FastQInputFormat is a subclass of FileInputFormat.
This won't work as expected because by default CrunchInputFormat.getSplits will end up using CrunchCombineFileInputFormat to split the file. This doesn't work because my custom FIleInputFormat uses a custom file splitter.
I can work around this by explicitly disabling the combining: e.g
source.inputConf(RuntimeParameters.DISABLE_COMBINE_FILE, Boolean.TRUE.toString());
but this doesn't strike me as the best solution. If I tell Crunch to use a custom InputFormat I shouldn't have to specify a second config option in order to tell Crunch to respect the getSplits function in my custom InputFormat.
I think CrunchInputFormat.getSplits should check that the format class exactly matches FileInputFormat; i.e. it isn't a subclass. For subclasses Crunch should use the getsplits function in the custom InputFormat class. I think changing the check to the following might work
if (format.getClass().equals(FileInputFormat.class) &&
!conf.getBoolean(RuntimeParameters.DISABLE_COMBINE_FILE, true)
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